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m in (-oo:+oo)
(7/8)*m = 9/10 // - 9/10
(7/8)*m-(9/10) = 0
(7/8)*m-9/10 = 0
7/8*m-9/10 = 0 // + 9/10
7/8*m = 9/10 // : 7/8
m = 9/10/7/8
m = 36/35
m = 36/35
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